The motion claims he cannot be sued because certain laws didn’t exist when allegations were made against him in 1991.
The news comes a day after federal agents reportedly raided the embattled music mogul's Miami and Los Angeles homes.
At a hearing before a federal appeals court, the singer's lawyer argued that prosecutors had failed to prove that Kelly violated a law used to target the Mafia.
Allen's former manager asked a judge to dismiss her lawsuit, but another sexual assault case against Allen still looms large.
The four-part Discovery show details the toxic workplace on Nickelodeon series and alleged assaults by former dialogue coach.
The judge in the case said the court "cannot rely on generalized, uncorroborated claims that disclosure would harm plaintiff to justify her anonymity."
The wide-ranging lawsuit, filed by Rodney "Lil Rod" Jones Jr., accuses Combs and several of his associates of various forms of misconduct.
The TV personality is no longer a judge on the 18th season of Fox series So You Think You Can Dance.
A summons with notice was originally filed in November, but a full lawsuit never followed.
One of the Def Jam founder's many accusers now says he defamed her during a podcast interview by suggesting someone might "re-imagine a story."